Abdominal exerciser



FIG. 1 is a front elevation view of an abdominal exerciser showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a perspective view thereof, shown in an alternate position. 

CLAIM I claim the ornamental design for an abdominal exerciser, as shown and described. 